224 



THE ARTICULATIONS. 



great cuneiform bone, one above, the other below the vascular channel formed 

 between these three bones. 



3. Two interosseous ligaments analogous to the preceding two. forming the 

 superior and inferior walls of the aforesaid channel. 



4. An interosseous scaphoido-cunean ligament, passing from the scaphoid to 

 the two cuneiform bones. 



5. An interosseous ligament, named the intercunean, is directed from one 

 cuneiform bone to the other, and is confounded with 

 the preceding ligament. 



The disposition of the lubricating membranes 

 varies with that of the articular facets. The follow- 

 ing is what is most generally observed : A proper 

 synovial membrane is specially destined for the facets 

 by which the scaphoid and gi'eat cuneiform bones 

 correspond ; this synovial membrane belongs also to 

 the two cuboido-scaphoid and posterior cuboido- 

 cunean arthrodiae. The anterior cuboido-scaphoid 

 diarthrosis receives a prolongation from the synovial 

 membrane of the two rows. The play of the anterior 

 cuboido-cunean and intercunean facets is facilitated 

 by two prolongations of the tarso-metatai'sal synovial 

 membrane. 



Movements almost null. 



Articulation of the two Rows with each 

 OTHER. — This arthrodial joint is formed by the union 

 of the calcis and the astragalus, on the one side, with 

 the scaphoid and cuboid bones on the other. Its 

 solidity is assured by six principal bands : 



1. The two lateral superficial ligaments of the 

 tibio-tarsal articulation. 



2. The calcaneo-metatarml ligament (Fig. 144, 

 3), a strong fibrous brace which unites the posterior 

 border of the calcis to the.cuboides, and to the head 

 of the external rudimentaiy metatarsal bone. It is 

 confounded, outwardly, with the external and super- 

 ficial tibio-tarsal ligament ; inwardly, with the pos- 

 terior tarso-metatarsal band. 



3. The astragalo-metatarsal ligament (Fig. 143, 

 7), a radiating fasciculus, the fibres of which leave the 

 internal tuberosity of the astragalus, become mixed 

 up with the internal and superficial tibio-tarsal liga- 

 ments in diverging downwards to the scaphoides, the great cuneiform bone, and 

 the upper extremity of the principal metatarsal bone. 



4. The posterior tarso-metatarsal ligament is a vast, very strong, and very 

 complicated fibrous arrangement, which binds, posteriorly, all the tarsal bones, 

 and also fixes them to the three portions of the metatarsus. This band, which is 

 crossed by several tendons and by the artery and vein lodged in the cuboido- 

 scaphoido-cunean canal, is continued below by the tarsal stay of the perforans 

 tendon. It therefore closely resembles the posterior carpal ligament. Its posterior 

 face is covered by the tendinous synovial membrane lining the tarsal sheath for 



ARTICULATIONS OF THE TARSUS 

 (LATERAL VIEW). 



1, External deep ligament; 2, 

 external superficial ligament ; 

 2', ring furnished by the latter 

 ligament for the passage of the 

 lateral extensor tendon of the 

 phalanges; 3, calcaneo-meta- 

 tarsal ligament ; 4, astragalo- 

 metatarsal ligament ; 5, small 

 cuboido-cunean ligament. A, 

 Cuboidal insertion of the flexor 

 muscle of the metatarsus ; B, 

 anterior orifice of the vascular 

 conduit of the tarsus ;C, groove 

 on the external tuberosity of 

 the tibia for the gliding of the 

 lateral extensor of the pha- 

 langes ; D, insertion of the gas- 

 trocnemius tendon of the leg 

 into the os calcis ; E, gliding 

 surface for that tendon. 



